<template>
  <div>数字:{{ num }}</div>
  <button @click="add">+1</button>
  <button @click="dec">-1</button>
</template>
<script>
export default {
data() {
return{
    num:1,
};
},
methods: {
    add() {
        this.num++;
    },
    dec(){
        this.num--;
    },
},
};
</script>
<style>
</style>